Vince, Vin, Vinnie, Cenzo.
Famous people named Vincenzo:
Composer Vincenzo Bellini; cyclist Vincenzo Nibali.
If you choose the name Vincenzo for your son, you'll have something in common with famed astronomer Galileo Galilei - he also gave his son this name. That practically makes you besties. Well, if he were still alive, that is.